<template>
  <div v-if="isShow">
    <div style="margin: 10px 0"><!-- 首页用户管理界面  -->
      <el-input style="width: 200px" placeholder="请输入名称" suffix-icon="el-icon-search" v-model="username"></el-input>
      <el-input style="width: 200px" placeholder="请输入邮箱" suffix-icon="el-icon-message" class="ml-5" v-model="email"></el-input>
      <el-input style="width: 200px" placeholder="请输入地址" suffix-icon="el-icon-position" class="ml-5" v-model="address"></el-input>
      <el-button class="ml-5" type="primary" @click="load">搜索</el-button>
      <el-button type="warning" @click="reset">重置</el-button>
    </div>

    <div style="margin: 10px 0">
      <!--          因为有弹出信息，所有新增这里需要一个事件@click="handleAdd"，再去添加handleAdd方法-->
      <el-button type="primary" @click="handleAdd" v-if="role === 'ROLE_ADMIN'">新增 <i class="el-icon-circle-plus-outline"></i></el-button>
      <!--          批量删除的二次确认
                    @confirm="delBatch"是批量删除的功能的实现
                    slot="reference"界面显示批量删除功能
      -->
      <el-popconfirm
          class="ml-5"
          confirm-button-text='确定'
          cancel-button-text='我再想想'
          icon="el-icon-info"
          icon-color="red"
          title="您确定批量删除吗？"
          @confirm="delBatch"

      >
        <el-button type="danger" slot="reference" v-if="role === 'ROLE_ADMIN'">批量删除 <i class="el-icon-remove-outline"></i></el-button>
      </el-popconfirm>

    <!--      上传-->
      <el-upload action="http://localhost:8888/user/import" :show-file-list="false" accept="xlsx" :on-success="handleExcelImportSuccess" style="display: inline-block">
        <el-button type="primary" class="ml-5" v-if="role === 'ROLE_ADMIN'">导入 <i class="el-icon-bottom"></i></el-button>
      </el-upload>

      <el-button type="primary" class="ml-5" @click="exp" v-if="role === 'ROLE_ADMIN'">导出 <i class="el-icon-top"></i></el-button>

    </div>

    <!--        页面信息-->
    <el-table :data="tableData" border stripe :header-cell-class-name="headerBg" @selection-change="handleSelectionChange">
      <!--          批量删除，组件-->
      <el-table-column type="selection" width="55"></el-table-column>
      <!--          页面展示的数据信息-->
      <el-table-column prop="id" label="ID" width="80"></el-table-column>
      <el-table-column prop="username" label="用户名" width="140"></el-table-column>
      <el-table-column prop="role" label="角色">
        <template slot-scope="scope">
          <el-tag type="primary" v-if="scope.row.role === 'ROLE_ADMIN' ">管理员</el-tag>
          <el-tag type="warning" v-if="scope.row.role === 'ROLE_TEACHER' ">老师</el-tag>
          <el-tag type="success" v-if="scope.row.role === 'ROLE_STUDENT' ">学生</el-tag>
        </template>
      </el-table-column>
      <el-table-column prop="nickname" label="昵称" width="120"></el-table-column>
      <el-table-column prop="email" label="邮箱"></el-table-column>
      <el-table-column prop="phone" label="电话"></el-table-column>
      <el-table-column prop="address" label="地址"></el-table-column>
      <el-table-column label="操作"  width="500" align="center">
        <template slot-scope="scope">
          <!--              从scope里面取数据-->
          <el-button type="primary" @click="lookCourse(scope.row.courses)" v-if="scope.row.role === 'ROLE_TEACHER' || scope.row.role === 'ROLE_ADMIN'">查看教授课程 <i class="el-icon-document"></i></el-button>
          <el-button type="warning" @click="lookStuCourse(scope.row.stuCourses)" v-if="scope.row.role === 'ROLE_STUDENT'">查看已选课程 <i class="el-icon-document"></i></el-button>
          <el-button type="success" @click="handleEdit(scope.row)" v-if="role === 'ROLE_ADMIN'">编辑 <i class="el-icon-edit"></i></el-button>

          <!--              为啥是.id,是因为后端删除方法是要传一个id值 @DeleteMapping("/{id}")-->
          <!--              删除的二次确认，弹窗组件
                            @confirm="del(scope.row.id)"是删除的功能的实现
                            slot="reference"界面显示删除功能
          -->
          <el-popconfirm
              class="ml-5"
              confirm-button-text='确定'
              cancel-button-text='我再想想'
              icon="el-icon-info"
              icon-color="red"
              title="您确定删除吗？"
              @confirm="del(scope.row.id)"
          >
            <el-button type="danger" slot="reference" v-if="role === 'ROLE_ADMIN'">删除 <i class="el-icon-remove-outline"></i></el-button>
          </el-popconfirm>
        </template>
      </el-table-column>
    </el-table>

    <div style="padding: 10px 0">

      <!--
          :current-page 当前页码     前端传过来的
          :page-size 当前每页的个数   前端传过来的
          :total                   后台返回到前端
      -->
      <el-pagination

          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="pageNum"
          :page-sizes="[5, 10, 15, 20]"
          :page-size="pageSize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total">
      </el-pagination>
    </div>

    <!-- 弹窗信息 -->
    <el-dialog title="用户信息" :visible.sync="dialogFormVisible" width="30%" >
      <el-form label-width="80px" size="small">
        <el-form-item label="用户名">
          <el-input v-model="form.username" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="角色">
          <el-select clearable v-model="form.role" placeholder="请选择角色" style="width: 100%">
            <el-option v-for="item in roles" :key="item.name" :label="item.name" :value="item.flag"></el-option>
          </el-select>
        </el-form-item>
        <el-form-item label="昵称">
          <el-input v-model="form.nickname" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="邮箱">
          <el-input v-model="form.email" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="电话">
          <el-input v-model="form.phone" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="地址">
          <el-input v-model="form.address" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="save">确 定</el-button>
      </div>
    </el-dialog>

    <el-dialog title="课程信息" :visible.sync="vis" width="30%" >
      <el-table :data="courses" border stripe>
        <el-table-column prop="name" label="课程名称"></el-table-column>
        <el-table-column prop="score" label="学分"></el-table-column>
      </el-table>
    </el-dialog>

    <el-dialog title="课程信息" :visible.sync="stuVis" width="30%" >
      <el-table :data="stuCourses" border stripe>
        <el-table-column prop="name" label="课程名称"></el-table-column>
        <el-table-column prop="score" label="学分"></el-table-column>
      </el-table>
    </el-dialog>

  </div>
</template>

<script>
export default {
  name: "User",
  data(){
    return{
      tableData: [],
      total: 0,
      pageNum: 1,
      pageSize: 10,
      username: "",
      email: "",
      address: "",
      form: {},
      role: localStorage.getItem("user") ? JSON.parse(localStorage.getItem("user")).role : null,
      dialogFormVisible: false,//控制弹窗开关闭
      multipleselection: [],
      headerBg: 'headerBg',
      isShow: localStorage.getItem("user"),
      roles: [],
      courses: [],
      vis: false,
      stuCourses: [],
      stuVis: false
    }
  },
  created() {
    this.load()
  },
  methods:{
    lookCourse(course) {
      this.courses = course
      this.vis = true
    },
    lookStuCourse(stuCourses) {
      this.stuCourses = stuCourses
      this.stuVis = true
    },
    //搜索查找数据
    load() {
      this.request.get("/user/page",{
        params:{
          pageNum: this.pageNum,
          pageSize: this.pageSize,
          username: this.username,
          email: this.email,
          address: this.address,
          role: localStorage.getItem("user") ? JSON.parse(localStorage.getItem("user")).role : null
        }
      }).then(res => {
        console.log(res)
        this.tableData = res.data.records
        this.total = res.data.total
      })

      this.request.get("/role/").then(res => {
        this.roles = res.data
      })
    },
    //重置搜索数据
    reset(){
      this.username = ""
      this.email = ""
      this.address = ""
      this.load() //重新载入数据
    },
    //新增
    handleAdd(){
      this.dialogFormVisible = true
      this.form = {}
    },
    //确定保存
    save() {
      this.request.post("/user/", this.form).then(res => {
        if (res) {
          this.$message.success("保存成功")
          this.dialogFormVisible = false
          this.load() //重新载入数据
        } else {
          this.$message.error("保存失败")
        }
      })
    },
    //编辑数据
    handleEdit(row){
      //this.form = row  将编辑的数据赋予到弹框,row是编辑里的数据,this.from弹框里信息
      this.form = JSON.parse(JSON.stringify(row)) //可以解决编辑未确认就改变的问题
      this.dialogFormVisible = true //将弹框打开
    },
    //删除数据
    del(id){
      //requst.xxx对应后端的路径（post，get，delete）
      this.request.delete("/user/"+id).then(res => {
        if (res) {
          this.$message.success("删除成功")
          this.load() //重新载入数据
        } else {
          this.$message.error("删除失败")
        }
      })
    },
    //批量删除,val可以自定义名字
    handleSelectionChange(val){
      console.log(val)
      this.multipleselection = val //将批量删除的数据（对象数组）赋值给this.multipleselection
    },
    delBatch(){
      let ids = this.multipleselection.map(v => v.id) // [{},{},[}] ==> [1,2,3] 把对象数组变成纯id数组，
      this.request.post("/user/del/batch",ids).then(res => {
        if (res) {
          this.$message.success("批量删除成功")
          this.load() //重新载入数据
        } else {
          this.$message.error("批量删除失败")
        }
      })
    },
    handleSizeChange(pageSize){
      console.log(pageSize)
      this.pageSize = pageSize
      this.load() // 切换页码重新请求数据
    },
    handleCurrentChange(pageNum){
      console.log(pageNum)
      this.pageNum = pageNum
      this.load() // 切换页数重新请求数据
    },
    exp(){
      window.open("http://localhost:8888/user/export")//窗口打开
    },
    handleExcelImportSuccess() {
      this.$message.success("导入成功")
      this.load()
    },
  }
}
</script>

<style>
.headerBg {
  background: #eee!important;
}
</style>